辽西中生代软流圈底辟体的脉动式上涌

邵济安; 陈福坤; 路凤香; 周新华

Volume 31 Issue 6

Jun. 2006

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SHAO Ji-an, CHEN Fu-kun, LU Feng-xiang, ZHOU Xin-hua, 2006. Mesozoic Pulsative Upwelling Diapirs of Asthenosphere in West Liaoning Province. Earth Science, 31(6): 807-816.

Citation:

SHAO Ji-an, CHEN Fu-kun, LU Feng-xiang, ZHOU Xin-hua, 2006. Mesozoic Pulsative Upwelling Diapirs of Asthenosphere in West Liaoning Province. Earth Science, 31(6): 807-816.

SHAO Ji-an, CHEN Fu-kun, LU Feng-xiang, ZHOU Xin-hua, 2006. Mesozoic Pulsative Upwelling Diapirs of Asthenosphere in West Liaoning Province. Earth Science, 31(6): 807-816.

Citation:

SHAO Ji-an, CHEN Fu-kun, LU Feng-xiang, ZHOU Xin-hua, 2006. Mesozoic Pulsative Upwelling Diapirs of Asthenosphere in West Liaoning Province. Earth Science, 31(6): 807-816.

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Mesozoic Pulsative Upwelling Diapirs of Asthenosphere in West Liaoning Province

1.
School of Earth and Space Sciences, Peking University, Beijing 100871, China
2.
Institute of Geology andGeophysics, Chinese Academy of Sciences, Beijing 100029, China
3.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
4.
Key laboratory of Mineral Resources, Chinese Academy of Sciences, Beijing 100029, China

Received Date: 2006-06-26
Publish Date: 2006-11-25

Abstract

Abstract

Petrologicos-geochemical data reveals the compositional features of Mesozoic volcanic rocks in West Liaoning: (1) Relatively high values of Mg^# and higher contents of Cr and Ni; (2) Most of volcanic magmas are derived from enriched lithospheric mantle hybridized by crust materials; (3) Considerable volcanic rocks have relatively high ε_Nd(t)values. Chronologic researches on the Mesozoic (230-65 Ma) volcanic rocks in West Liaoning and adjacent areas indicate that the volcanic activities were periodic with an average period of 20-30 Ma, and that the peak ages of the volcanic activities were determined at 230 Ma, 190 Ma, 160 Ma, 130-120 Ma, 110-100 Ma, and 80 Ma, respectively. Temporally, the ε_Nd(t)values of the volcanic rocks also show similar periodic variation responsible for the ages. Specifically, the Mesozoic-Cenozoic volcanic rocks are distributed in a ring-like shape with their ages ranging from old to young in an outward order from the center. These evidences lead to the conclusion that the Late Mesozoic volcanic activities in the study area are related to pulsative upwelling diapirs of asthenosphere, for which a natural passage is provided by the specific tectonic background confined by large-scale lithospheric faults in the study area.
- West Liaoning,
- Mesozoic volcanic rocks,
- isotopic age,
- ε_Nd(t),
- diapir of asthenosphere.

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References(54)

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Mesozoic Pulsative Upwelling Diapirs of Asthenosphere in West Liaoning Province

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